UFCThe Ultimate Fighting Championship (UFC) is a U.S.-based mixed martial arts organization, recognized as the largest MMA promotion in the world. The UFC is headquartered in Las Vegas, Nevada and is owned and operated by Zuffa, LLC. This promotion is responsible for solidifying the sport's postion in the history-books.
UFC is currently undergoing a remarkable surge in popularity, along with greater mainstream media coverage. UFC programming can now be seen on FOX, FX, and FUEL TV in the United States, as well as in 35 other countries worldwide.

My gut is telling me that a win against Nelson does nothing for his cred or putting anywhere near a title shot. A lose to Roy would severally hurt his cred. Also if he is French he might be worried about visa issues no sense taking a fight you might not be able to get into the US for. I know at best he is HW gate keeper but looking at it from his perspective.

exactly

people also have to realize that managers/teams have to agree to contracts before a fighter signs. Nelson is good....but fighting him would have done nothing for Kongos career currently